Advertisements
Advertisements
प्रश्न
You are given a hammer, a battery, a bulb, wires and a switch.
- How could you use them to distinguish between samples of metals and non-metals?
- Assess the usefulness of these tests in distinguishing between metals and non-metals.
उत्तर
- We can beat the sample with the hammer. If it can be beaten into thin sheets (that is, it is malleable), then it is a metal; otherwise, it is a non-metal. If the bulb glows the sample is metal, a good conductor of electricity. If, on the other hand, the bulb does not glow, the sample is non-metal, a bad conductor of electricity.
- Iron and many other metals are malleable and can be cast into sheets for roofing, trunks, boxes, and storage of articles of daily use. Metals are good conductors of electricity, so copper and aluminium wires are used for carrying electricity. The above tests are useful in distinguishing between metals and non-metals as they are based on their physical properties. No chemical reactions are involved in these tests.
APPEARS IN
संबंधित प्रश्न
Give an example of a metal which is a poor conductor of heat.
Give reasons for the following.
Aluminium foils are used to wrap food items.
Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.
Name two metals which are used for making electric wires.
Name a non-metal that is hardest naturally occurring substance
State two important uses of following non-metal
Uses of graphite
Why are alloys made?
Define metal and non-metal on the basis of electron loss or gain.
Name:
a non-malleable metal
Name:
a non metal which is lustrous
Give the balanced reactions for the following:
Sodium is dropped in water
Give the balanced reactions for the following:
Iron reacts with dilute HCI
Give a short account of heating effect on metal carbonates based on the activity series ?
Name a non-metal which can form a positive ion.
Explain the following:
Metals like calcium and magnesium are never found in their free state in nature.
With reference to the physical properties of metals and non-metals, state the following exception.
A non-metal which conducts electricity.
The sound of one metal colliding with another makes a noise, this property is called as _______.
Identify who I am!
Metal in Liquid state- _______
Reason out
Sulphur is used in the vulcanization of rubber.
